2023年AP考试报名正式开启，附报名流程！不同专业方向如何选择报考科目？
9月19日，美国大学理事会College Board?宣布大陆2023年AP考试报名正式开启。在2022-23学年，大学理事会继续与Prometric合作管理国内的AP考试报名和考务工作。 美国大学先修课程(Advanced Placement)，简称AP课程...
2023年AP课程商科学科考试报名开启！AP社会考生报名火热咨询中
相信很多家长都知道，AP是北美留学申请非常重要的一个法宝。但AP种类繁多，同学们该如何选择合适自己的课程，从而助力大学专业的申请呢？2023年AP课程商科学科考试报名开启！尤其是社会考生！不要错过这次的机会...
Edexcel A Level Chemistry:复习笔记6.3.4 Ligand Exchange
Ligand Exchange Ligand exchange?(or?ligand?substitution) is when one?ligand?in a complex is replaced by another Ligand exchange forms a new complex that is?more stable?than the original one ...
Edexcel A Level Chemistry:复习笔记6.3.3 Reactions of Ions in Aqueous Solution
Reactions with Hydroxide & Ammonia When transition metal ions in aqueous solution react with aqueous sodium hydroxide and aqueous ammonia they form precipitates However some of these pre...
Edexcel A Level Chemistry:复习笔记6.3.2 Chromium
Reduction & Oxidation of Chromium Species For chromium we need to consider the following standard electrode potential values We will use zinc and hydrogen peroxide as oxidising agents Th...
Edexcel A Level Chemistry:复习笔记6.3.1 Vanadium
Colours & Oxidation States Vanadium is a transition metal which has variable oxidation states The table below shows the important ones you need to be aware of Addition of zinc to the van...
Edexcel A Level Chemistry:复习笔记6.2.12 Autocatalysis
Manganese(II) ions as an Autocatalyst Autocatalysis the term used to describe a reaction which is speeded up by a product which acts as a catalyst for the reaction If you plot a rate graph o...
Edexcel A Level Chemistry:复习笔记6.2.11 Homogeneous Catalysis
Homogeneous Catalysts Homogeneous?catalyst is in the same physical state (phase) as the reactants This means they are either all gases, or more often, all in aqueous solution Homogenous cata...
Edexcel A Level Chemistry:复习笔记6.2.10 Heterogeneous Catalysis
Heterogeneous Catalysts A?heterogeneous?catalyst is in a different physical state (phase) from the reactants Heterogeneous catalysts are usually solids whereas the reactants are gaseous or i...
